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I use the SPK1 all the time. The few I have managed NOT to lose long enough for this to happen, I took apart and the wires to the probe had broken at the pivot point, most likely from opening/closing one to many times.

If I don't lose one, I usually get about 1 to 1 1/2 years out of them before i get a LLL on the screen (and I use them several times a day).

All that being said I still love the SPK1. The folding feature is great for wedging it in a duct, and allowing the temp to stabilize while doing something else. I know It lasts longer than other pocket thermometers because the probe folds away. I have broken so many where the metal probe meets the plastic housing.